JP2000081110A - Pressurization type differential limiting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a differential limiting member by cancelling pressurization of a pressurization imparting member during ordinary running wherein there is no need for a differential limit torque. SOLUTION: A differential limit force is generated by braking a space between the relative rotation parts 9 and 10 of a differentiating device by transmitting the drive force of a differential case 1 to right and left side gears 4 and 5, arranged on the rotary shaft of the differential case 1, through a differential gear 2 through torque distribution. In a so formed pressurization type differential limiting device, a cancel member 8 is provided to cancel pressurization of the pressurization imparting member 12 when a given engagement reaction force is generated at the differential gears 2, 4, and 5. A given engagement reaction force during normal running is generated by a comparatively high drive force. Since contact between the relative rotation parts of the pressurization imparting member 12 and multidisc clutches 9 and 10 is released by the cancel member 8, wear of the contact surface is decreased and durability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relative rotating portion of a differential device for transmitting the rotational driving force of a differential case through a differential gear to left and right side gears disposed on a rotation shaft of the differential case by distributing the torque. The present invention relates to a pressurized differential limiting device that obtains a differential limiting force by an initial torque by braking the space between the pressurized members.

[0002]

2. Description of the Related Art As a pressurized differential limiting device which obtains a differential limiting force by an initial torque by braking a relative rotating portion of a differential device comprising a differential gear of this kind by a pressurizing member, for example, FIG. Is disclosed in Japanese Patent Publication No. 38-18254. In this conventional example, the rotational driving force of the differential case 110 is
4, a pair of outer plates 68 that rotate together with the differential case 110 between a relative rotating portion of the differential device that transmits and distributes torque to left and right side gears 50 and 52 disposed on the rotation axis of the differential case 110. Side gear 50
A multi-plate clutch composed of the inner plate 70 and the inner plate 70 that rotates together is braked by a pressurized disc spring 72 that urges in the axial direction to obtain a differential limiting force. The ring 88
Is a regulating member that abuts against the shoulder 90 of the differential case 110.

[0003]

As seen in such a conventional example, the multiple disc clutch disposed between the differential case and the side gear, which is located between the relative rotating portions of the differential, is axially biased. When a differential limiting force is obtained by the braking force of the pressurized disc spring, when a relatively small driving force is applied, such as when starting on a slippery road surface, a predetermined initial torque is obtained by braking by the pressurized disc spring. And the vehicle can start safely from a slippery road surface without slipping. However, in such a pressurized differential limiting device, a pressurizing disc spring, which is a pressurizing member, always attaches a multi-plate clutch arranged between relative rotating portions of the differential device in the axial direction. Because the initial torque is generated by force, the vehicle escapes from a slippery road surface and shifts to normal running with a large driving force, and even if the differential limiting force is no longer necessary, there are still many pressurized disc springs. Continue to bias the plate clutch in the axial direction. For this reason, the contact surface and the relative rotation are constantly repeated between the pressurized disc spring and the multi-plate clutch, so that the contact surface may be worn, and the durability of the pressurized disc spring and the multi-plate clutch is reduced. there were.

Accordingly, the present invention solves the above-mentioned problems of the conventional differential limiting device, and can cancel the pressurization of the pressurizing member during normal running where the differential limiting torque is not required. An object of the present invention is to provide a pressurized differential limiting device with improved durability of members.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a differential device for transmitting the rotational driving force of a differential case to left and right side gears disposed on a rotation shaft of the differential case through a differential gear. In a pressurized differential limiting device that obtains a differential limiting force by braking a relative rotating portion with a pressurizing member, when a predetermined meshing reaction force is generated in the differential gear, the pressing of the pressurizing member is performed. It is characterized in that a canceling member for canceling the pressure is provided. Further, in the present invention, the pressurizing member is constituted by a pressurizing disc spring for urging in the axial direction a multi-plate clutch composed of an outer plate group that rotates together with the differential case and an inner plate group that rotates together with the side gear. In addition, a push rod is arranged between the back surface of the side gear and the pressurized disc spring. Further, the present invention is characterized in that a pressure plate is arranged between the push rod and the pressurized disc spring. Further, in the present invention, the pressurizing member is constituted by a pressurizing disc spring for urging in the axial direction a multi-plate clutch composed of an outer plate group that rotates together with the differential case and an inner plate group that rotates together with the side gear. In addition, a push step portion which is in contact with the pressurized disc spring is formed near an axially outer end face of the side gear. Further, the present invention is characterized in that a pressure plate is arranged between the push step portion and the pressurized disc spring,
These are the means for solving the problem.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pressurized differential limiting device according to the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a pressurized differential limiting device according to the present invention.
1A is an overall cross-sectional view, and FIG. 1B is a view on arrow A in FIG. 1A. The pressurized differential limiting device according to the present invention is configured such that the rotational driving force of the differential case 1 is meshed with a bevel gear such as a helical gear such as a plurality of pinion gears 2 supported by a pinion shaft 3 orthogonal to the rotation axis of the differential case 1. Left and right side gears 4 arranged on the rotation axis of the differential case 1 via differential gears
The differential pressurizing member brakes the relative rotating portion of the differential device which transmits the torque to the differential transmission device 5 to obtain a differential limiting force. As shown in FIG. The outer plate 9 rotates together with the differential case 1 (in the example shown, the left and right differential cases 1A and 1B are integrally fastened by bolts and the right differential case 1B is further divided into two parts by a pinion shaft). A pressurized disc spring 12 for axially urging a multi-plate clutch composed of a group, a left side gear 4 (which may be disposed on the right side gear 5 side) and an inner plate 10 group that rotates together. The multi-plate clutch may be provided on both left and right sides.

[0007] As shown in FIG. 1 (B), the left differential case 1
The lug 9A of the outer plate 9 is engaged with the axially outer groove 13 engraved on the inner periphery of the left differential case 1A so that only the axial movement can be performed. The inner plate 10 group is mounted on the left side gear 4 by inserting the inner plate 10 into the axial inner groove 14 formed on the outer periphery of the left side gear 4.
The lug 10A is engaged so that only axial movement is possible.
A case flange 6 extending radially inward from the right differential case 1B is arranged between the multi-plate clutch composed of the outer plate 9 group and the inner plate 10 group and the back surface 7 of the left side gear 4. Even if the meshing reaction force between the pinion gear 2 and the left and right side gears 4, 5 increases and each side gear moves outward in the axial direction, the left side gear 4 abuts on the case flange 6 and is restricted. The initial torque by the pressurized disc spring 12 is maintained at a constant value independently of the force.

In the present invention, the rotational driving force of the differential case 1 is transmitted to the left and right side gears 4, 5 arranged on the rotational shaft of the differential case 1 via a pinion gear 2 which is a differential gear.
In a pressurized differential limiting device that obtains a differential limiting force by braking a relative rotating portion of a differential device that transmits and distributes torque to a pinion gear 2, a predetermined engagement between the pinion gear 2 and a side gear. In the present embodiment, a group of outer plates 9 and a group of inner plates 10 of the multi-plate clutch are provided because a canceling member is provided to cancel the pressurization of the pressurizing member when a reaction force is generated. When a predetermined meshing reaction force is generated on the differential gear, the pressurized disc spring 12 that is the pressurizing disc spring 12 that is the pressurizing disc spring 12 As a canceling member for canceling, a push rod 8 is arranged between the back surface of the side gear 4 and the pressurized disc spring 12. As shown in FIG. 1, the push rod 8 penetrates the case flange 6 and is slidably inserted in the axial direction. As shown in FIG. 1B, the inner periphery of the differential case 1A, the inner plate 9 and the inner plate 9 are formed. It is arranged in a gap between the outer periphery of the plate 10. The outer end of the push rod 8 is in contact with a pressurized disc spring 12 via a pressure plate 11.

FIG. 2 shows a second embodiment of the pressurized differential limiting device according to the present invention.
FIG. 2 is a cross-sectional view of a main part of an embodiment, in which a pressurized disc spring 12 for urging and braking between an outer plate 9 group and an inner plate 10 group of a multi-plate clutch in an axial direction is shown. The side gear 4 serves as a canceling member for canceling the pressurization of the pressurizing disc spring 12 as the pressurizing applying member when a predetermined meshing reaction force is generated in the differential gear.
The point that the push rod 8 is disposed between the back surface of the spring and the pressurized disc spring 12 is the same as that of the first embodiment, but in the present embodiment, The push rod 8 slidably inserted in the direction is arranged in a gap between the outer periphery of the left side gear 4 and the inner periphery of the inner plate 10 and the inner plate 10. The outer end of the push rod 8 is in contact with a pressurized disc spring 12 via a pressure plate 11. Therefore, while the push rod 8 of the first embodiment is arranged on the outer peripheral side of the multiple disc clutch, the push rod 8 of the second embodiment is different from that of the first embodiment.
Are arranged on the inner peripheral side of the multi-plate clutch.

FIG. 3 shows a third embodiment of the pressurized differential limiting device according to the present invention.
FIG. 4 is a cross-sectional view of a main part showing an embodiment. In the present embodiment, a pressurizing disc spring 12 for urging and braking a multi-plate clutch composed of a group of outer plates 9 and a group of inner plates 10 in the axial direction is applied. As a canceling member for canceling the pressure, a push step portion 15 is formed near the axially outer end surface of the side gear (left) 4 in contact with the pressurized disc spring 12. Push step 15 of the left side gear 4
Is in contact with a pressurized disc spring 12 via a pressure plate 11. In the present embodiment, the pressurizing of the pressurized disc spring 12 can be directly canceled by the push step portion 15 of the left side gear 4 that is axially moved by the meshing reaction force generated between the pinion gear 2 and the side gear 4.

FIG. 4 shows a fourth embodiment of the pressurized differential limiting device according to the present invention.
FIG. 14 is a cross-sectional view of a main part showing an embodiment. In this embodiment, similarly to the third embodiment, a multi-plate clutch including an outer plate 9 group and an inner plate 10 group is attached in the axial direction. As a canceling member for canceling the pressurization of the pressurized disc spring 12 for urging and braking, a push step portion 15 is formed in the vicinity of the axially outer end surface of the left side gear 4. The push step portion 15 of the left side gear 4, which cancels the pressurization of the pressurizing disc spring 12 which is a pressure applying member, is driven by the left side gear 4 axially moved by the meshing reaction force generated between the pinion gear 2 and the left side gear 4. However, the pedestal plate 16 on which the pressurized disc spring 12 is seated is configured to be pressed outward in the axial direction. Thereby, the pressurization of the pressurized disc spring 12 can be canceled.

Although the embodiment of the present invention has been described above, the present invention is not limited to the differential using the helical gear type pinion gear of the above-described embodiment, but may be applied to other axial directions. The present invention can also be applied to a differential limiting device of a type that can obtain an engagement reaction force. Further, the type of the pressurizing member for applying the pressurization is not limited to the pressurized disc spring, and various pressurizing spring types may be adopted. Further, as for the type and the like of a member such as a pressure plate disposed between the canceling member for canceling the pressurization of the pressurizing member and the pressurizing member, appropriate ones can be adopted, and the pressure plate is not provided. Is also good. The shape and arrangement of the push rod disposed between the back surface of the side gear and the pressurized disc spring, the shape of the push step formed on the side gear, and the like can be appropriately adopted.

[0013]

As described above in detail, according to the present invention, the differential drive for transmitting the rotational driving force of the differential case to the left and right side gears arranged on the rotation shaft of the differential case through differential gears. In a pressurized differential limiting device that obtains a differential limiting force by braking a relative rotating portion of a moving device by a pressurizing member, when a predetermined meshing reaction force is generated in the differential gear, the pressurizing is applied. By providing a canceling member such as a push rod to cancel the pressurization of the member,
When a slip occurs when starting with a low driving force, etc.
The pressurizing disc spring or the like as the pressurizing member axially urges the multi-plate clutch disposed between the relative rotating portions of the differential device to generate a predetermined initial torque to perform the differential limiting action. We can start safely. Then, once the vehicle escapes from the slippery road surface and shifts to normal running with a large driving force and no longer needs the differential limiting force, it is determined according to the meshing reaction force between the differential gear and the side gear. Since the pressurizing of the pressurizing applying member such as the pressurizing disc spring to the multi-plate clutch can be released by the canceling member such as the push rod, the contact and the contact between the pressurizing disc spring and the multi-plate clutch are constantly maintained. The durability of the pressurized disc spring and the multi-plate clutch due to wear of the contact surface due to repeated relative rotation is eliminated.

Further, the pressure of a pressurizing member such as a pressurizing disc spring for urging and braking the multi-plate clutch composed of an outer plate group and an inner plate group, which is a relative rotating portion of the differential device, in the axial direction. As a cancellation member to cancel,
If a push step that contacts the pressurized disc spring is formed near the axially outer end face of the side gear, the push step of the side gear directly cancels the pressurization of the pressurizing member. Therefore, there is no need to install a member such as a push rod, and the number of parts is reduced and the cost is reduced. As described above, according to the present invention, during normal traveling that does not require the differential limiting torque, the pressurizing type differential limiting member in which the pressurizing of the pressurizing applying member can be canceled and the durability of the differential limiting member is improved. An apparatus is provided.

[Brief description of the drawings]

1 shows a first embodiment of a pressurized differential limiting device according to the present invention, wherein FIG. 1 (A) is an overall sectional view, and FIG. 1 (B) is a view taken in the direction of arrow A in FIG. 1 (A). It is.

FIG. 2 is a sectional view showing a main part of a pressurized differential limiting device according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of a pressurized differential limiting device according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing a main part of a pressurized differential limiting device according to a fourth embodiment of the present invention.

FIG. 5 is an overall sectional view of a conventional pressurized differential limiting device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 differential case 1A left differential case 1B right differential case 2 pinion gear 3 pinion shaft 4 left side gear 5 right side gear 6 case flange 7 side gear back surface 8 push rod 9 outer plate 10 inner plate 11 pressure plate 12 pressurized plate spring 15 push step 16 base plate

Claims (5)

[Claims] 1. A pressurizing member for a relative rotating portion of a differential device for transmitting a rotational driving force of a differential case to a left and right side gears disposed on a rotation shaft of the differential case through a differential gear by distributing torque. In a pressurized differential limiting device that obtains a differential limiting force by braking with a canceling member that cancels the pressurizing of the pressurizing applying member when a predetermined meshing reaction force is generated in the differential gear. A pressurized differential limiting device. 2. A pressurizing disc spring configured to axially urge a multi-plate clutch comprising an outer plate group that rotates together with a differential case and an inner plate group that rotates together with a side gear. 2. The pressurized differential limiting device according to claim 1, wherein a push rod is arranged between the back surface of the side gear and the pressurized disc spring. 3. The pressurized differential limiting device according to claim 2, wherein a pressure plate is disposed between the push rod and the pressurized disc spring. 4. The pressurizing member is constituted by a pressurizing disc spring for axially urging a multi-plate clutch composed of an outer plate group that rotates together with the differential case and an inner plate group that rotates together with the side gear. 2. The pressurized differential limiting device according to claim 1, wherein a push step portion that abuts on the pressurized disc spring is formed near an axially outer end surface of the side gear. 3. 5. The pressurized differential limiting device according to claim 4, wherein a pressure plate is arranged between the push step portion and the pressurized disc spring.